Functionality - ABB Relion Technical Manual

Section 8
Current protection
8.8.2
8.8.3
8.8.4
262

Functionality

Inadvertent or accidental energizing of off-line generators has occurred often enough due
to operating errors, breaker head flashovers, control circuit malfunctions, or a
combination of these causes. Inadvertently energized generator operates as induction
motor drawing a large current from the system. The voltage supervised overcurrent
protection is used to protect the inadvertently energized generator.
Accidental energizing protection for synchronous generator (AEGGAPC, 50AE) takes
the maximum phase current input from the generator terminal side or generator neutral
side and maximum phase to phase voltage inputs from the terminal side. AEGGAPC
(50AE) is enabled when the terminal voltage drops below the specified voltage level for
the preset time.
Function block
AEGGAPC (50AE)
I3P* TRIP
V3P* RI
BLOCK ARMED
BLKTR
ANSI09000783-1-en.vsd
ANSI09000783 V1 EN
Figure 119: AEGGAPC (50AE) Function block
Signals
Table 135: AEGGAPC (50AE) Input signals
Name Type
I3P GROUP
SIGNAL
U3P GROUP
SIGNAL
BLOCK BOOLEAN
BLKTR BOOLEAN
Table 136: AEGGAPC (50AE) Output signals
Name Type
TRIP BOOLEAN
START BOOLEAN
ARMED BOOLEAN
Default Description
- Three Phase Current input
- Three Phase Voltage input
0 Block of function
0 Block of trip
Description
Trip signal from inadvertant energization protection
Pick up from inadvertant energization
True when accidental energizing protection is armed
1MRK 502 048-UUS A
Technical manual